[clang][test] Require x86 target for new Windows EH tests
Added by https://github.com/llvm/llvm-project/pull/144745.
These tests cause Clang -cc1 to generate the option
-x86-asm-syntax=intel, which is only available if you have
included the x86 target.
<<<<<<
1: clang: warning: argument unused during compilation: '-c' [-Wunused-command-line-argument]
label:38'0 X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
label:38'1 ? possible intended match
2: clang (LLVM option parsing): Unknown command line argument '-x86-asm-syntax=intel'. Try: 'clang (LLVM option parsing) --help'
label:38'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3: clang (LLVM option parsing): Did you mean '--asan-stack=intel'?
label:38'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>>>>
